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SOLVENCY

Head to head

GPT-5.6 Sol vs DeepSeek V4 Flash

GPT-5.6 Sol: currentDeepSeek V4 Flash: currentheavy tier

Verdict · measured basis

DeepSeek V4 Flash costs 82x less per solved task.

On output token price alone, DeepSeek V4 Flash looks 23x cheaper (11x on input). The ranking holds, but the margin changes.

Source: Artificial Analysis (artificialanalysis.ai) · verified 2026-08-21 · prices from each provider's pricing page

Input $/M tokens

lower is better

  • GPT-5.6 Sol$5
  • DeepSeek V4 Flash$0.44

Output $/M tokens

lower is better

  • GPT-5.6 Sol$30
  • DeepSeek V4 Flash$1.32

Cost per solved task

measured basis · lower is better

  • GPT-5.6 Sol$9.88
  • DeepSeek V4 Flash$0.12
GPT-5.6 SolDeepSeek V4 Flash
Input $/Mtok$5$0.44
Output $/Mtok$30$1.32
Cached input $/Mtok$0.5$0.014
Pass rate65%50%
Pass rate sourceAAAA
Cost basismeasuredmeasured
Cost per solved task$9.88$0.12

verified 2026-08-21 · heavy task tier; measured rows ignore the tier· Methodology· GPT-5.6 Sol· DeepSeek V4 Flash